Electrochemistry and ion concentration, Chemistry

Assignment Help:

ELECTROCHEMISTRY AND ION CONCENTRATION

Activity dependence of cell voltage:

Measurement of galvanic cell potentials away from the standard state provides a convenient method for measuring ion activity and activity coefficient. As ion concentration is varied in a half-cell to vary ion activity. Equilibrium position of the half cell reduction reaction changes and that causes a change in the half-cell potential. The relationship between the activity and half-cell potential is given by the Nernst equation:

890_electrochemistry.png

for the general half-cell reduction reaction:

 aA+bB+ne-→cC+dD

Cells at equilibrium:

When a cell is at equilibrium, Ecell=0 (the 'flat battery' condition) and Q=K, the equilibrium constant for the reaction (see Topic C1). This gives the expression: which allows calculation of equilibrium constants (see Topic C1) for cell reactions from calculated or measured values.

 

199_electrochemistry1.png

which allows calculation of equilibrium constants for cell reactions from calculated or measured 1046_electrochemistry2.png values.


Related Discussions:- Electrochemistry and ion concentration

Wavelength of a spectral line for an electronic transition, The wavelength ...

The wavelength of a spectral line for an electronic transition is inversely related to: (1) The number of electrons undergoing the transition (2) The nuclear charge of the a

Geiger marsden experiment, Geiger Marsden experiment The Rutherford exp...

Geiger Marsden experiment The Rutherford experiment (also known as the Gold foil experiment or the Geiger-Marsden experiment) was an experiment to probe the structure of the at

SOLID STATE, HOW UNIT CELL AND SPACE LATTICE ARE RELATED TO EACH OTHER?

HOW UNIT CELL AND SPACE LATTICE ARE RELATED TO EACH OTHER?

Equivalent mass by hydrogen displacemnt, 0.205g of a metal on treatment wit...

0.205g of a metal on treatment with dilute acid gave 106.6ml of hydrogen collected over water at 755mm pressure and 17 degree Celsius. calculate the equivalent mass of the metal. (

Seperation, what techniques can you use to separate solute from liquid

what techniques can you use to separate solute from liquid

Volumetric analysis - stoichiometry, you are provided with a monobasic acid...

you are provided with a monobasic acid , HX with a concentration in the range of 0.5moldm-3. You arerequired to plan and carry out an experiment to determine that exact concentrati

Which kind of volcano is the most destructive, Which kind of volcano is the...

Which kind of volcano is the most destructive? Well each type of volcano can be very destructive and if you are talking in human loss of life terms than the answer is any type

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd